When someone dies unexpectedly, violently, or under unclear circumstances, a coroner takes legal custody of the body and works to answer three questions: who is this person, what killed them, and how did it happen? That process involves scene investigation, physical examination, laboratory testing, and official certification of the death. Roughly one in three deaths gets reported to a coroner’s office, though the exact proportion varies by jurisdiction.
Which Deaths Go to a Coroner
Coroners don’t handle every death. A person who dies of a known illness under a doctor’s care typically has their death certificate signed by that physician. A coroner steps in when the death raises questions. State laws spell out specific triggers, and while they vary, most jurisdictions require coroner involvement for:
- Sudden deaths not explained by a recognized disease
- Deaths involving violence or trauma, whether suspected homicide, suicide, or accident
- Deaths where alcohol, drugs, or toxic substances may have played a role
- Deaths during or shortly after surgery that aren’t explained by a prior condition
- Deaths in police custody or prison
- Unidentified or unclaimed bodies
- Sudden infant deaths
- Deaths of people whose bodies will be cremated or buried at sea, making later examination impossible
In Pennsylvania, for example, the coroner is also required to investigate deaths suspected to involve contagious disease that could pose a public hazard, and all stillbirths. The common thread across states is that if the cause or circumstances of death aren’t clear, the coroner has a legal duty to find out.
What Happens at the Scene
The coroner’s involvement begins before the body ever reaches a morgue. An investigator responds to the location where the person was found and performs an initial assessment: checking for signs of life, noting the position of the body, and documenting the surrounding environment. They photograph the scene, record the temperature, and look for anything that might explain what happened, such as medications, drug paraphernalia, signs of a struggle, or suicide notes.
A chain of custody is established immediately. One person is designated as the custodian of all evidence, and every item collected from that point forward is logged with details about who handled it and when. This matters because findings may eventually be presented in court. The body is then placed in a body bag, sealed, and transported to the coroner’s facility.
Identifying the Body
If the person’s identity isn’t already known, the coroner’s office uses a hierarchy of methods to establish it. The most straightforward is visual identification by a family member, but this isn’t always possible or reliable, especially in cases involving decomposition, fire, or severe trauma.
Fingerprints are one of the most common scientific identification tools. No two people share identical fingerprints, including identical twins. Even when skin has begun to separate from the hands due to decomposition, investigators can sometimes slip the detached skin over a gloved hand like a glove and use it to capture a print. Those prints are then compared against existing records.
Dental records are equally powerful. Fillings, implants, root shapes, and sinus structures are unique to each person and show up clearly on X-rays. A postmortem dental X-ray can be matched against a person’s records from their dentist. When neither fingerprints nor dental records are available, or when remains are severely decomposed, DNA analysis becomes the primary tool. Dental pulp inside teeth can serve as a DNA source even in heavily decomposed remains, though the hard enamel outer layer of teeth does not contain enough cells to be useful.
Surgical hardware like joint replacements, plates, and screws often carry unique serial numbers that can be traced back to a specific patient through hospital records.
The External Examination
Every body that comes through a coroner’s office receives an external examination. The body is completely undressed, and the examiner inspects every region: front, back, scalp, and all body openings. They’re looking for injuries, needle marks, bruising patterns, unusual skin discoloration, and any signs that point toward an unnatural death.
Specific findings raise red flags. Hemorrhages in the whites of the eyes can suggest strangulation or suffocation. Unusual coloring of livor mortis (the settling of blood after death) can indicate poisoning. Tablet residue in the mouth points to a possible overdose. The examiner also documents tattoos, scars, and birthmarks, which can help with identification and provide a medical history of sorts. This external exam alone is sometimes enough to determine the cause of death, particularly when injuries are clearly fatal.
When an Autopsy Is Performed
If the external exam doesn’t provide a clear answer, the coroner orders an autopsy, a full internal examination. Not every body that reaches a coroner’s office is autopsied, but the law requires one whenever the cause and manner of death can’t otherwise be determined.
The most common approach uses a Y-shaped or I-shaped incision running down the chest and abdomen to open the torso. This allows the examiner to access and inspect the heart, lungs, liver, kidneys, and other organs. Each organ is removed, weighed, and examined for disease, injury, or abnormalities. A separate incision across the back of the scalp, from behind one ear to the other, allows access to the brain.
There are several established techniques for how organs are removed. Some examiners take organs out one at a time for individual inspection. Others remove entire blocks of connected organs together, or even take all the cervical, thoracic, and abdominal organs out as a single mass. The choice depends on the case and the examiner’s training. In deaths where hidden bruising might be significant, such as deaths in police custody, the skin of the back and limbs may be reflected with additional incisions to reveal bleeding beneath the surface that wouldn’t be visible otherwise.
Tissue samples from various organs are preserved for microscopic examination, which can reveal disease processes invisible to the naked eye.
Toxicology and Lab Testing
In cases where poisoning, overdose, or intoxication is suspected, the coroner collects biological samples for toxicology analysis. This is one of the most important steps, and the range of samples taken can be surprisingly broad.
Blood is the primary sample, typically drawn from the large vein in the thigh to avoid contamination from decomposition processes in the torso. Heart blood is also collected, though it’s generally used for screening rather than precise measurement because substances can migrate into it from surrounding organs after death. Urine, stomach contents, and vitreous humor (the gel-like fluid inside the eye) are also routinely collected. Vitreous humor is particularly useful for confirming alcohol levels because it’s isolated from the rest of the body and less affected by decomposition, helping investigators distinguish between alcohol someone drank while alive and alcohol produced naturally by bacteria after death.
The liver is collected in nearly every toxicology case because it processes most substances that enter the body and acts as a storage depot, making drugs easier to detect there than in blood. Lung tissue is taken when inhaled toxins like butane or solvents are suspected. Brain tissue is relevant for drugs that act on the central nervous system. In fire deaths where blood may not be available, the spleen is useful because it can reveal carbon monoxide and cyanide exposure.
These samples are screened for a wide range of substances including alcohol, opioids, stimulants, benzodiazepines, antidepressants, and environmental poisons. Results typically take several weeks to come back, which is why a coroner’s final report often lags well behind the death itself.
Classifying the Death
Once all the evidence is in, the coroner determines two things: the cause of death and the manner of death. The cause is the specific medical reason the person died, such as a gunshot wound to the chest or an overdose of a particular substance. The manner of death is a legal classification that falls into one of five categories: natural, accident, homicide, suicide, or undetermined. These classifications carry enormous legal weight. A ruling of homicide triggers a criminal investigation. A ruling of accident versus suicide can determine whether a life insurance policy pays out.
The coroner then signs the death certificate, which becomes a permanent legal record. This document is required before a family can proceed with a funeral, cremation, or burial. It’s also used to settle estates, process insurance claims, and update government records.
Storage and Release of the Body
Throughout this process, the body is kept in refrigerated storage at the coroner’s facility to slow decomposition. If a case is complex or identification takes time, bodies are moved to frozen storage after 30 days in refrigeration, or sooner if the condition of the body is deteriorating. Once the examination is complete and the death certificate is issued, the body is released to the next of kin or their chosen funeral home.
For unclaimed or unidentified bodies, the timeline is longer. The coroner’s office will hold the remains while attempting identification, sometimes for months. If no one comes forward, the body is eventually buried or cremated according to local regulations, though DNA samples and dental records are typically preserved in case someone searches for the person later.
Coroners vs. Medical Examiners
The term “coroner” is often used interchangeably with “medical examiner,” but they’re different roles. A coroner is an elected county official who, in many jurisdictions, is not required to have medical training. A medical examiner is an appointed physician, typically board-certified in forensic pathology. Some states use one system, some the other, and some use a mix. In practice, even in coroner systems, the actual autopsy is usually performed by a forensic pathologist, whether on staff or contracted. The coroner’s role in those cases is more administrative and legal: deciding which deaths to investigate, signing off on findings, and sometimes convening inquests.